Observers when retracted by pistons(using a 1-tick pulse) from a redstone wire or repeater, will power the repeater through the air in-between. This will break a multitude of contraptions.
I ran into this while trying to make a piston door.
I hope this is not a duplicate. I have not found others exactly like this.
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Now with the additional observer I've been able to replicate it. However either this is the only problem or there is a visual bug attached to it since I didn't see the observer "blinking" when retracting, which I believe should normally happen.
Did some further testing. Seems to be consistent with repeaters but I couldn't replicate it when replacing it with redstone dust.
This is a duplicate of MC-160258. See the explanation there for what is happening. The observer isn't powering through air blocks, the repeater is just on 8 gt of delay so it is (visually) powered once the observer is already retracted. The powering occurred before the observer was moved.
Sadly could not replicate :\